Dressed in a blue oxford shirt and neatly-pressed khakis, Diego Torres-Palma looks like any other MBA student. But what sets the 26-year-old entrepreneurial engineer apart is his choice of neckwear. On this particular day, it happens to be a butterfly style, three-inch paisley silk bow tie. As cofounder of OoOTie [http://www.oootie.com/], Boston's only online bow tie boutique, Torres-Palma (GSM'13) is an ambassador for what has become one of the hippest accessories in men's fashion.